TylosinLeucomycinsChromatography, High Pressure LiquidStreptomycesMonensinLiver AbscessPsychomotor PerformanceAnti-Bacterial AgentsTask Performance and AnalysisFermentationValine Dehydrogenase (NADP+)Fusobacterium necrophorumAnimal FeedTrimethylsilyl CompoundsCattleIsobutyratesLithiumLincomycinMacrolidesMass SpectrometryAthletic PerformanceReproducibility of ResultsSwineSpiramycin